Stir 1 (6 ounce) can frozen lemonade concentrate, thawed into 1 quart low- calorie cranberry juice cocktail. Slowly add 1 (16 ounce) bottle low calorie lemon lime carbonated beverage, stir gently with an up and down movement. Serve over ice. Garnish with lemon slices. Float thin lemon slices on top of a brilliant red pink drink.